(since I forget to take my USB to class)

#include "stdafx.h"
#include <iostream>

#include <ctime>
#include <cstdlib>
using  namespace std;
//function
char getRandomCharacter(char ch1,char ch2)
{ 

   return static_cast<char>(ch1+rand()%(ch1-ch2+1));
}

int main()
{ //display the uppercase

 srand(time(0));
 for(int i=1;i<=10;i++)   //for the ten row
  {for(int j=1;j<=10;j++)//for the ten charaters in one row
   cout<<getRandomCharacter('a','z');
  cout<<endl;
  }
 //dispaly the single digit
 for(i=1;i<=10;i++)
  {for(int j=1;j<=10;j++)//for the ten charaters in one row
   cout<<getRandomCharacter('0','9');
  cout<<endl;
  }
return 0;
}

 

 

(the second)

#include "stdafx.h"
#include <iostream>
#include <ctime>
#include <cstdlib>
#include <cmath>
using  namespace std;

int main()
{ double sum=0;
 double x;
 srand(time(0));
 for(int i=1;i<=10;i++)
 { x=fmod(rand(),1000.0);
  sum=sum+x;
 }
 double mean=sum/10;

 double sum1=0,sum2=0;
 for(i=1;i<+10;i++)
 { x=fmod(rand(),1000.0);
  sum1=sum1+x*x;
  sum2=sum2+x;
 }
 double deviation=sqrt((sum1-sum2*sum2/10)/9);

 cout<<"Mean is "<<mean<<endl;
 cout<<"Deviation is "<<deviation<<endl;
 return 0;
}